Sound amplifier



July 28, 1925. 1,547,535

M. VAN BLARICOM ET AL SOUND AMPLIFIER Filed Feb. 15, 1924 WITNEssEsINI/'zm/TORab ATTORNEYS Patented July 28, 1925. i

UNITED STATES v1,547,535 PATENT OFFICE.

Y MILLARD VAN BLARICOM, OF MONTCLAIR, WALTER LE BLANC. OF HILLSIDE,

NEW JERSEY; SAID VAN BLARICOM ASSIGNOR OF HIS ENTIRE RIGHT TO CHARLES H.PAYNE, OF MALBA, NEW YORK.

soUND AMPLIFIETL` Application filed February 15, 1924. Serial No.698,084.

To all wlw/m it ma. concer/n.:

Be it known t at we, MILLARD VAN BLARICOM and WALTER LE BLANC, bothcitizens of the United States, and residents, respectively, of Montclairin the county of Essex and State of New dersey, and of Hillside(Elizabeth), in the county of Union and State of New Jersey, haveinvented a new andV Improved Sound Amplifier, of which the following isa full, clear, :and exact description.

The present" invention relates to new and useful improvements inampliing devices, and it pertains more particular y to an amplifierespecially adapted for use in connection with radio apparatus.

It is one of the objects of theinvention to provide a new and improvedsound amplifier inwhich the sound waves are directed or broadcast in ahorizontal plane.

1t is a further object of the invention to provide a device of thischaracter in which the sound waves will radiate therefrom in ahorizontal plane, thus making the device non-directional as to thegreatest volume, as is the common horn type of amplifying devlce.

It is a further object of the invention to construct the device in sucha manner that the volume of sound distributed thereby will be equal inall directions.

lVith the above and other objects in view, reference is had to theaccompanying drawin s, in which igure l is a view in elevation of adevice constructed in accordance with the present invention;

Fig. 2 is a vertical sectional view thereof;

Fig. 3 is a horizontal sectional view thereof taken on the line 3 3 of1., and

Fig. 4 is a vertical sectional view of a sli htly modified form of theinvention.

eferring to the drawings by reference numeral, the device comprises abase 10, an amplifying chamber 11, and-a top 12, said top beingpreferably of an ornamental nature.

In that form of t-he invention Ashown in Figs. 1 to 3, the base isprovided with a outout portion 13 adapted to receive a so-called loudspeaker unit, and leading from the' cut-out portion 13 there is apassage 14.

The amplifying chamber 11 is provided with a passage 15 which isflaredoutwardly,

the body of the amplifying chamber being preferably thickened anddesignated by the reference character 16 to permit of such aconstruction. The top wall 17 of the ampllfymg chamber is provided witha depending portion 18, which is adapted to overlie the upper end of theflared passage 15. The side walls of the amplifying chamber .11 areprovided with a plurality of openings 19 and mounted between said open-1ngs 19 there is a plurality of radially-disposed partitions 20, whichpartitions extend from a point substantially at the center of the.amplifying cabinet outwardly and so arranged as to provide two outletopenings 19 between each two partitions 20. The inner ends 21 of thesepartitions terminate at a point short of the discharge end of the flaredpassage 15, as shown in Fig. 2. The ornamental top'12 heretoforementioned, is secured to the top wall 17 of the amplifying chamber andits lower face designated by the reference numeral 22, is flat, whichconstruction provides a chamber 23 directly over the center of theamplifying cabinet and superimposed with respect to the fiared passage15..

This form of the'device operates as follows: z

The sound waves from the speaking unit (not shown) pass upwardly throughthe passage 14 and through the flared passage 15 and are projectedagainst the depending portion 18 of, the top wall 17 of the amplifyingcabinet. This directs the sound waves in a horizontal plane radially ofthe amplifying chamber 11 and the sound waves pass outwardly of theamplifying chamber 11 through the openings 19 in all directions in equalvolume. The partitions 2() serve to provide the amplifying chamber intoa plurality of outwardly-dared compartments, and, at the same time,prevent a swirling or a rotary motion of the sound waves within theamplifying cabinet 11, which in some instances might reduce the volumeof the sound emanating from the amplifying cabil net 11. The chamber 23being a dead space serves to prevent a loss of sound waves due tovibration of the top wall of the cabinet 17 and thus causes practicallyall of the sound4 waves emitted from the flared paswardly through thebase 30 there is a passage 32 which terminates in a flared portion 33leading `into an amplifying chamber 34. This" amplifying chamber 34 isprovided with a plurality of outlet openings 35, and

having a depressed portion 36 which overlies the flared portion 33 ofthe passage 32. The top 38 in this form is `provided with a bottommember 39, which forms in combination with the depressed portion 36, av

'dead-air chamber 40 directly overlying the 'flared portion 33 of thepassage 32. 20

The operation of the form of the device shown in Fig. 4, is similar tothat described for the form shown in Figs. 1 to 3, with the exceptionthat in the form shown in Fig. 4, there are no partitions 20 or othermeans to prevent a rotary or swirling acttion of the sound Waves Withinthe amplifying chamber. v

What is claimed is:

1. A device of the character described comprising a base member and anamplifying Vchamber supported thereby, said amplifying chamber havinglaterally directed v outlet o enings, and means associated with the ampifying chamber to prevent a swirling action of the sound Wavestherewithin.

2. In a device ofthe character described,

an amplifying chamber, means for introducing sound Waves thereto, meansarranged in the path of said sound Waves for causing them to spreadlaterally of the amplifying n chamber, and a dead-alr chamber providedhas its top closed by means of va Wall 37 \Qat the rear of saidlast-mentioned means.

` 3. 'A device of the. character described comprising a pedestal, anamplifying chamber carried thereby, said pedestal having a passagewaytherethrough, said passageway having communication with said' amplifyingchamber, and a dead-air chamber forming a part of said amplifyingchamber and positioned vdirectly vover said passageway. l

4. In a'device of the character described, an amplifyingl chamber, meansfor introducing sound waves laterally of said amplifying chamber, and aplurality of radially extending vertically disposed'partitions forpreventing a rotary movement of said sound waves Within the amplifyingchamber.

MILLARD VANA BLARICOM. lvs TAL'rnR L E BLANC.

